Leptogenesis via a varying Weinberg operator: a semi-classical approach Supported by European Research Council under ERC Grant NuMass (FP7-IDEAS-ERC ERC-CG 617143), H2020 funded ELUSIVES ITN (H2020-MSCA-ITN-2015, GA-2015-674896-ELUSIVES), InvisiblePlus (H2020-MSCA-RISE-2015, GA-2015-690575-InvisiblesPlus), and Fermi Research Alliance, LLC under Contract (DE-AC02-07CH11359)

Pascoli, Silvia ( Institute for Particle Physics Phenomenology, Department of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom) ; Turner, Jessica ( Theoretical Physics Department, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510, USA) ; Zhou, Ye-Ling ( Institute for Particle Physics Phenomenology, Department of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom)

12 March 2019

Abstract: In this paper, we introduce leptogenesis via a varying Weinberg operator from a semi-classical perspective. This mechanism is motivated by the breaking of an underlying symmetry which triggers a phase transition that causes the coupling of the Weinberg operator to become dynamical. Consequently, a lepton anti-lepton asymmetry arises from the interference of the Weinberg operator at two different spacetime points. Using the semi-classical approach, we treat the Higgs as a background field and show that a reflection asymmetry between leptons and anti-leptons is generated in the vicinity of the bubble wall. We solve the equations of motion of the lepton and anti-lepton quasiparticles to obtain the final lepton asymmetry.


Published in: Chinese Phys. C 43 (2019) 033101
Published by: Institute of Physics Publishing/Chinese Academy of Sciences
DOI: 10.1088/1674-1137/43/3/033101
arXiv: 1808.00475
License: CC-BY-3.0



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